Messages in this thread | | | Date | Thu, 02 Oct 2003 15:10:04 -0400 | From | Jeff Garzik <> | Subject | Re: Minutes from 10/1 LSE Call |
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insecure wrote: > That sounds reasonable, but today's RAM throughput is on the order > of 1GB/s, not 100Mb/s. 'Out of L1' theory can't explain 100Mb/s ceiling > it seems.
cp(1) data, at least, will never ever be in L1. Copying data you need to look at the ends of the pipeline -- hard drive throughput, PCI bus bandwidth, FSB bandwidth, speed at which ext2/3 allocates blocks, and similar things are likely bottlenecks.
You'll never hit RAM bandwidth limits, unless your copies are extremely tiny, and entirely in L2 or pagecache.
Jeff
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